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</a></div> <!----></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>解决模块间通信问题</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/notebook/apache-http-client/" aria-current="page" class="sidebar-link">为什么存在通信问题</a></li><li><a href="/notebook/apache-http-client/Apache HttpClient.html" class="sidebar-link">Apache HttpClient</a></li><li><a href="/notebook/apache-http-client/Jackson.html" aria-current="page" class="active sidebar-link">Jackson</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/notebook/apache-http-client/Jackson.html#jackson-简介" class="sidebar-link">Jackson 简介</a></li><li class="sidebar-sub-header"><a href="/notebook/apache-http-client/Jackson.html#jackson-特点" class="sidebar-link">Jackson 特点</a></li><li class="sidebar-sub-header"><a href="/notebook/apache-http-client/Jackson.html#jackson-注解" class="sidebar-link">Jackson 注解</a></li><li class="sidebar-sub-header"><a href="/notebook/apache-http-client/Jackson.html#jackson-使用实例" class="sidebar-link">Jackson 使用实例</a></li></ul></li><li><a href="/notebook/apache-http-client/创建 API 接口模块.html" class="sidebar-link">创建 API 接口模块</a></li><li><a href="/notebook/apache-http-client/你怎么理解 RESTful.html" class="sidebar-link">你怎么理解 RESTful</a></li><li><a href="/notebook/apache-http-client/什么是幂等性.html" class="sidebar-link">什么是幂等性</a></li><li><a href="/notebook/apache-http-client/实现 RESTful 风格的 API.html" class="sidebar-link">实现 RESTful 风格的 API</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="jackson"><a href="#jackson" class="header-anchor">#</a> Jackson</h1> <h2 id="jackson-简介"><a href="#jackson-简介" class="header-anchor">#</a> Jackson 简介</h2> <p>Jackson 是一个简单基于 Java 应用库，Jackson 可以轻松的将 Java 对象转换成 json 对象和 xml 文档，同样也可以将 json、xml 转换成 Java 对象。Jackson 所依赖的 jar 包较少，简单易用并且性能也要相对高些，并且 Jackson 社区相对比较活跃，更新速度也比较快。</p> <h2 id="jackson-特点"><a href="#jackson-特点" class="header-anchor">#</a> Jackson 特点</h2> <ul><li>容易使用 - jackson API 提供了一个高层次外观，以简化常用的用例。</li> <li>无需创建映射 - API提供了默认的映射大部分对象序列化。</li> <li>性能高 - 快速，低内存占用，适合大型对象图表或系统。</li> <li>干净的 JSON - jackson 创建一个干净和紧凑的 JSON 结果，这是让人很容易阅读。</li> <li>不依赖 - 库不需要任何其他的库，除了 JDK。</li> <li>开源代码 - jackson 是开源的，可以免费使用。</li></ul> <h2 id="jackson-注解"><a href="#jackson-注解" class="header-anchor">#</a> Jackson 注解</h2> <p>Jackson 类库包含了很多注解，可以让我们快速建立 Java 类与 JSON 之间的关系。</p> <h3 id="jsonproperty"><a href="#jsonproperty" class="header-anchor">#</a> <code>@JsonProperty</code></h3> <p><code>@JsonProperty</code> 注解指定一个属性用于 JSON 映射，默认情况下映射的 JSON 属性与注解的属性名称相同，不过可以使用该注解的 <code>value</code> 值修改 JSON 属性名，该注解还有一个 <code>index</code> 属性指定生成 JSON 属性的顺序，如果有必要的话。</p> <h3 id="jsonignore"><a href="#jsonignore" class="header-anchor">#</a> <code>@JsonIgnore</code></h3> <p><code>@JsonIgnore</code> 注解用于排除某个属性，这样该属性就不会被 Jackson 序列化和反序列化。</p> <h3 id="jsonignoreproperties"><a href="#jsonignoreproperties" class="header-anchor">#</a> <code>@JsonIgnoreProperties</code></h3> <p><code>@JsonIgnoreProperties</code> 注解是类注解。在序列化为 JSON 的时候，<code>@JsonIgnoreProperties({&quot;prop1&quot;, &quot;prop2&quot;})</code> 会忽略 <code>pro1</code> 和 <code>pro2</code> 两个属性。在从 JSON 反序列化为 Java 类的时候，<code>@JsonIgnoreProperties(ignoreUnknown=true)</code> 会忽略所有没有 <code>Getter</code> 和 <code>Setter</code> 的属性。该注解在 Java 类和 JSON 不完全匹配的时候很有用。</p> <h3 id="jsonignoretype"><a href="#jsonignoretype" class="header-anchor">#</a> <code>@JsonIgnoreType</code></h3> <p><code>@JsonIgnoreType</code> 也是类注解，会排除所有指定类型的属性。</p> <h3 id="jsonpropertyorder"><a href="#jsonpropertyorder" class="header-anchor">#</a> <code>@JsonPropertyOrder</code></h3> <p><code>@JsonPropertyOrder</code> 和 <code>@JsonProperty</code> 的 <code>index</code> 属性类似，指定属性序列化时的顺序。</p> <h3 id="jsonrootname"><a href="#jsonrootname" class="header-anchor">#</a> <code>@JsonRootName</code></h3> <p><code>@JsonRootName</code> 注解用于指定 JSON 根属性的名称。</p> <h2 id="jackson-使用实例"><a href="#jackson-使用实例" class="header-anchor">#</a> Jackson 使用实例</h2> <h3 id="对象的序列化与反序列化"><a href="#对象的序列化与反序列化" class="header-anchor">#</a> 对象的序列化与反序列化</h3> <div class="language-text extra-class"><pre class="language-text"><code>package com.funtl.hello.httpclient;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

public class JsonTester {
    public static void main(String[] args) {
        // 创建 ObjectMapper 对象
        ObjectMapper mapper = new ObjectMapper();
        String jsonString = &quot;{\&quot;name\&quot;:\&quot;Mahesh\&quot;, \&quot;age\&quot;:21}&quot;;

        try {
            // 反序列化 JSON 到对象
            Student student = mapper.readValue(jsonString, Student.class);
            System.out.println(student);

            // 序列化对象到 JSON
            String json = mapper.writeValueAsString(student);
            System.out.println(json);
        } catch (JsonParseException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class Student {
    private String name;
    private int age;

    public Student() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String toString() {
        return &quot;Student [ name: &quot; + name + &quot;, age: &quot; + age + &quot; ]&quot;;
    }
}
</code></pre></div><h3 id="集合的序列化与反序列化"><a href="#集合的序列化与反序列化" class="header-anchor">#</a> 集合的序列化与反序列化</h3> <div class="language-text extra-class"><pre class="language-text"><code>package com.funtl.hello.httpclient;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class JsonTester {
    public static void main(String[] args) {
        // 创建 ObjectMapper 对象
        ObjectMapper mapper = new ObjectMapper();
        String jsonString = &quot;{\&quot;draw\&quot;:1,\&quot;recordsTotal\&quot;:1,\&quot;recordsFiltered\&quot;:1,\&quot;data\&quot;:[{\&quot;id\&quot;:33,\&quot;title\&quot;:\&quot;ad1\&quot;,\&quot;subTitle\&quot;:\&quot;ad1\&quot;,\&quot;titleDesc\&quot;:\&quot;ad1\&quot;,\&quot;url\&quot;:\&quot;https://sale.jd.com/act/XkCzhoisOMSW.html\&quot;,\&quot;pic\&quot;:\&quot;https://m.360buyimg.com/babel/jfs/t20164/187/1771326168/92964/b42fade7/5b359ab2N93be3a65.jpg\&quot;,\&quot;pic2\&quot;:\&quot;\&quot;,\&quot;content\&quot;:\&quot;&lt;p&gt;&lt;br&gt;&lt;/p&gt;\&quot;}],\&quot;error\&quot;:null}&quot;;

        try {
            // 反序列化 JSON 到树
            JsonNode jsonNode = mapper.readTree(jsonString);

            // 从树中读取 data 节点
            JsonNode jsonData = jsonNode.findPath(&quot;data&quot;);
            System.out.println(jsonData);

            // 反序列化 JSON 到集合
            JavaType javaType = mapper.getTypeFactory().constructParametricType(ArrayList.class, TbContent.class);
            List&lt;TbContent&gt; tbContents = mapper.readValue(jsonData.toString(), javaType);
            for (TbContent tbContent : tbContents) {
                System.out.println(tbContent);
            }

            // 序列化集合到 JSON
            String json = mapper.writeValueAsString(tbContents);
            System.out.println(json);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class TbContent {
    private Long id;
    private String title;
    private String subTitle;
    private String titleDesc;
    private String url;
    private String pic;
    private String pic2;
    private String content;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getSubTitle() {
        return subTitle;
    }

    public void setSubTitle(String subTitle) {
        this.subTitle = subTitle;
    }

    public String getTitleDesc() {
        return titleDesc;
    }

    public void setTitleDesc(String titleDesc) {
        this.titleDesc = titleDesc;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public String getPic2() {
        return pic2;
    }

    public void setPic2(String pic2) {
        this.pic2 = pic2;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    @Override
    public String toString() {
        return &quot;TbContent{&quot; +
                &quot;id=&quot; + id +
                &quot;, title='&quot; + title + '\'' +
                &quot;, subTitle='&quot; + subTitle + '\'' +
                &quot;, titleDesc='&quot; + titleDesc + '\'' +
                &quot;, url='&quot; + url + '\'' +
                &quot;, pic='&quot; + pic + '\'' +
                &quot;, pic2='&quot; + pic2 + '\'' +
                &quot;, content='&quot; + content + '\'' +
                '}';
    }
}
</code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2021/4/15 上午12:33:56</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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